Interfacial polycarbonate preparation by adding additional solve

Details Interfacial polycarbonate preparation by adding additional solve Interfacial polycarbonate preparation by adding additional solve

1984-08-03

1985-07-16

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, 528199, C08G 6362

Patent

active

045297916

ABSTRACT:
An interfacial process for the preparation of polycarbonates having improved optical properties is disclosed wherein dihydric phenols are reacted with phosgene in the presence of an aqueous alkali solution and an organic solvent. After the polycarbonate oligomers are formed, the reaction mixture is diluted with additional solvent (25 to 125 volume percent). A polymerization catalyst such as triethylamine is then added to generate high molecular polycarbonates and the resins are then recovered.

REFERENCES:
patent: 3945969 (1976-03-01), Horn et al.
patent: 4122112 (1978-10-01), Koda et al.
patent: 4255557 (1981-03-01), Megumi et al.

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